Finding the Fourth Proportional to 20,755.17, 31,143.69 and 9,054.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,755.17 : 31,143.69 = 9,054.72 : x
2. Step 2: Convert to fraction form
   20,755.17/31,143.69 = 9,054.72/x
3. Step 3: Cross multiply
   20,755.17x = 31,143.69 × 9,054.72
4. Step 4: Simplify right side
   20,755.17x = 281,997,392.72
5. Step 5: Solve for x
   x = 281,997,392.72/20,755.17
6. Step 6: Final answer
   x = 13,586.85